All categories

4 years ago

How do scientist gather data to find reliable answers to questions?

Chemistry

1 answer:

GenaCL600 [577]4 years ago

8 0

Answer:they run multiple tests to make sure it is a fact that it is right

Explanation:

You might be interested in

8.45 cm - 3.55 cm = ?

lyudmila [28]

Answer:

4.9cm or 4.90cm

Explanation:

Use column method and align the numbers. Make sure you add the decimal point before you write the answer, otherwise the value would be wrong.

6 0

3 years ago

Read 2 more answers

What kind of change is sodium hydroxide dissolving in water

Korolek [52]

Physical change because water is not a gas or change . you can see through it.

6 0

4 years ago

If 16.8 mL of the analyte H2C2O4 (oxalic acid) is titrated with 0.501 M KOH to 13.54 mL, determine the mass of the analyte.

Neko [114]

Answer:

Mass of Analyte H2C2O4 = 18.18 grams

Explanation:

The balanced equation is:

$H_{2}C_{2}O_{4}+2KOH\rightarrow K_{2}C_{2})_{4}+H_{2}O$

The Molarity of Oxalic acid needed can be determined using: $M_{1}V_{1}=M_{2}V_{2}$

Here M1 = Molarity of Oxalic acid

V1 = Volume of oxalic acid

M2 = Molarity of KOH and V2 = Volume of KOH

M1 = ? , V1 = 16.8 mL , M2 = 0.501 M , V2 = 13.54 mL

Put the values and solve for M2,

$M_{1}V_{1}=M_{2}V_{2}$

$2\times M_{1}(16.8)=0.501\times 13.54$

We are multiplying by 2 because , 1 H2C2O4 needs 2 KOH

$M_{1}=\frac{0.501\times 13.54}{2\times 16.8}$

$M_{1}=0.202M$

Hence Molarity of H2C2O4 =

0.202 M

Molar mass = H2C2O4 = 2x1 +2x12 + 4x16

= 2+24+64 = 90 gram

$Mole =molarity\times Molar\ mass$

$Moles=0.202\times 90$

18.18 gram

8 0

3 years ago

Amateur radio operators in the United States can transmit on several bands. One of those bands consists of radio waves with a wa

NeTakaya

Answer:

7.5 × 10¹⁵ Hz

Explanation:

Given data

Wavelength of the radio waves (λ): 40 nm = 40 × 10⁻⁹ m = 4.0 × 10⁻⁸ m

Frequency of the radio waves (ν): ?

Speed of light (c): 3.00 × 10⁸ m/s

We can determine the frequency of the radio waves using the following expression.

c = λ × ν

ν = c/λ

ν = (3.00 × 10⁸ m/s)/4.0 × 10⁻⁸ m

ν = 7.5 × 10¹⁵ s⁻¹ = 7.5 × 10¹⁵ Hz

5 0

3 years ago

If an element has 3 valance electrons what row is it in?

klemol [59]

It can be any row

Explanation:

An element with a valence electrons of 3 can be in any row on the periodic table.

The rows are the horizontal arrangement of elements on the periodic table.

Elements on the same row have the same energy level.

The periodic table rows are called periods.
It is only in the groups that we can find such element.
Group 3 elements have 3 valence electrons.
Since this group cuts through all the rows, therefore, elements with 3 valence electrons can be found in any row.

learn more:

Metalloids brainly.com/question/3023499

#learnwithBrainly

8 0

3 years ago